Units 1-3
Chemistry is the study of:
a. candles, b. the metric system, c. reactions, d. matter
d. matter
As you move from left to right across the periodic table, electron affinity:
a. generally increases, b. generally decreases., c. does not change
a. generally increases
Write the formula of the ionic compound consisting of the positive ion and negative ion below:
Mg2+ and Cl-
MgCl2
How many moles of hydrogen gas react with one mole of oxygen gas?
2H2 + O2 --> 2H2O
a. 1 mol, b. 2 mol, c. 3 mol, 4. 4 mol
b. 2 mol H2
In a solution, the substance that is present in the greater amount is the:
a. solute
b. solvent
b. solvent
What is the volume of a cube if each side measures 2.0 cm?
a. 8.0 cm, b. 8.0cm3, c. 2.0 cm, d. 6.0 cm3
b. 8.0cm3
A column on the periodic table is called a _____________. A row on the periodic table is called a ______________.
choose from: period, gang, friend, family, generation
family, period
What is the molecular formula for:
carbon tetrachloride?
C - carbon, Cl - chlorine
CCl4
Suppose it takes 1 pizza crust, 2 cups of sauce, and 1 cup of cheese to make a cheese pizza. You have 5 pizza crusts, 15 cups of sauce, and 3 cups of cheese.
How many cheese pizzas can you make?
3 cheese pizzas. Cheese is the limiting factor.
A solution with more solute dissolved than normally possible is said to be _______________.
a. unsaturated
b. saturated
c. supersaturated
c. supersaturated
What is it called when a solid turns directly into a gas?
a. melting, b. boiling, c. freezing, d. sublimation
d. sublimation
Elements in the Noble Gas family are considered stable because they have _______________ outer energy levels.
full (filled)
Balance this equation:
___ Al + ___ O2 ---> ____ Al2O3
4Al + 3O2 ---> 2Al2O3
The volume of a gas is doubled while the temperature is unchanged. The pressure of the gas:
a. is one-half the original pressure
b. is doubled
c. varies depending on the gas
d. remains unchanged.
a. is one-half the original pressure
To make a 4.00 M solution, how many moles of solute will be needed if 12.0 liters of solution are required?
4.0 M = moles of solute/12.0 L
moles of solute = 48.0 mol
The lowest energy state of an atom is called the:
a. excited state., b. ground state., c. independent state., d. configurational state.
b. ground state.
What is the difference between a cation and an anion?
cation is a positive ion, formed when atom LOSES electrons.
anion is negative ion, formed when atom GAINS electrons.
How many atoms are in 1 mole?
6.02 x 1023
If A & B are inversely related and we double A, what happens to the value of B?
It becomes 1/2 its original value.
Bases react with __________ to produce a salt and ________________.
acids, water
What sub level or sub levels are present in main energy level number one?
a. s, b. s and p, c. s and p and d, d. s,p,d,f
a. s
The type of bonding that involves a transfer of electrons is:
a. ionic, b. covalent, c. metallic
a. ionic
Calculate the molar mass for aluminum hydroxide, Al(OH)3
Al = 27.0 g/mole
O = 16.0 g/mole
H = 1.0 g/mole
27.0 + 3(16.0) + 3(1.0) = 78.0 g
Calculate the pressured exerted by a 120 pound woman wearing high heels with a surface area of 0.02 square inches as she walks across a wooden floor.
Pressure = force/area
120 pounds/0.02in2 = 6000 pounds/in2
A pH value of less than 7 indicates a(n) _______ solution. a pH value of _____ indicates a neutral solution. A pH value of more than 7 indicates a(n) ________ solution.
acidic, neutral, basic